/etc/periodic/daily/spamassassin-update is useless
Sorry, but whoever wrote /etc/periodic/daily/spamassassin-update needs to RTFM. As presently written the script achieves nothing useful.
(1) I quote from https://spamassassin.apache.org/full/3.2.x/doc/sa-update.html
“Note that sa-update will not restart spamd or otherwise cause a
scanner to reload the now-updated ruleset automatically. Instead,
sa-update is typically used in something like the following manner:
sa-update && /etc/init.d/spamassassin reload”
(2) The script also needs to take into account the need to run sa-compile where installed.
(from redmine: issue id 10208, created on 2019-04-07, closed on 2019-06-19)